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Ventilatory thresholds during short- and long-term exercise.

T Reybrouck, J Ghesquiere, A Cattaert

    Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
    |December 1, 1983
    PubMed
    Summary
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    The ventilatory threshold for long-term exercise is a better predictor of running performance than the threshold during graded exercise. Both thresholds correlate with maximal oxygen uptake (VO2 max) but not when expressed as a percentage of VO2 max.

    Area of Science:

    • Exercise Physiology
    • Sports Science
    • Human Performance

    Background:

    • The ventilatory threshold indicates the intensity at which ventilation increases disproportionately during exercise.
    • Two types of ventilatory thresholds exist: one for short-term exercise and one for long-term exercise.

    Purpose of the Study:

    • To examine the relationship between short-term and long-term ventilatory thresholds.
    • To determine how these thresholds relate to maximal oxygen uptake (VO2 max) and endurance performance.
    • To identify the most specific predictor of running performance.

    Main Methods:

    • Eight healthy males (20-53 years) performed exercise tests.
    • Maximal oxygen uptake (VO2 max) and 12-min running distance were measured.
    • Ventilatory thresholds for short-term and long-term exercise were determined.

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    Main Results:

    • A strong correlation (r=0.84) was found between the two ventilatory thresholds.
    • Both thresholds correlated with VO2 max when expressed in absolute values, but not as a percentage of VO2 max.
    • Endurance performance was significantly correlated with both thresholds (r=0.73 and r=0.82).

    Conclusions:

    • The ventilatory threshold for long-term exercise is a more specific predictor of running performance than the threshold identified during graded exercise.
    • VO2 max and the long-term ventilatory threshold are key predictors of 12-min running distance.